In late 2019 I purchased a Juki KE730. It had a few problems to begin with, so it was a battle right from the start to get it up and running. After fixing some issues(was some dry joints on a fet mounted to one of the power supply cases)(comms issue between main pc and sub cpu) I got it running then had to stumble my way around the software, trying to figure out how to make this thing do anything!
After a lot of manual reading and still some hair pulling getting the pick and place export format correct so flexprog could convert it, I finally managed to run a job on it(was about a month or 2 after receiving it)
I still had some intermittent vision problems which I think may have mostly come to the smA connectors on the laser cards needing to be done up tight with a spanner.
I did recently have a laser card fail, but luckily I purchased some spare laser cards and laser sensors really quite cheaply in the scheme of things.
I also have purchased a spare subcpu board, main computer and communications card, downlooking camera and many other bits that are good to have on hand just in case.
I also purchased a bunch more feeders.
The feeders are pretty good, but they will wear in the cover tape pulling wheel and when they get old and worn don't pull the tape well.
Sometimes the pin in the centre of the cover tape puller loosens off a little. The screw is held with locktite, you have to heat the shaft to get the locktite to let go before you can tighten it and lock it again.
Some /most of the old feeders I purchased needed a good service and lube before I could put them into service, but I did get them at a good price.
One disappointing thing about the 730(not sure on the other models) maximum part height, 6mm. In reality there is enough clearance to go higher, but when the nozzles have placed a part they go up to just over 6mm, so if you play tricks with the machine trying to get that 6.8mm high part to place, you're going to get burned
Running the machine with the lid open helped a lot to see WTF was happening as it runs at snails pace like that.
Setting the jobs up is a bit clunky, but once you figure it out and they are set up you can pretty much load the job, hit go, put your board in and walk away.
It is impressive how fast that big heavy gantry moves!
And you will want to add a forklift you your toy collection if you have not got one already.
If you are somewhere like the USA where machines like this go cheap at auctions etc, why not get one and get another as a spare parts box?
Much better than a Chinese toy.